The Daily Question
Which 20th century Pope was the first to be elected on the first day of balloting for the first time in several centuries?
1. Pope Pius XII
2. Pope John XXIII
3. Pope Paul Vi
4. Pope John Paul I
Your answer was: Pope Pius XII
You are correct!!
Answer: On March 2, 1939, sixty-two cardinals gathered and elected Eugenio Pacelli to be Pope Pius XII. It was the first time in several centuries that a Pope had been on the first day of balloting.
Reference
• William Wonneberger, "The Vatican Postage Stamps"
National Philatelic Museum Volumn 7 Number 1 (This publication was produced for the 1954 Marian Year Philatelic Exhibition held in Philadelphia September 22 - November 5, 1954.)
• Anonymous,
Election Of Pius XII Vatican Notes Volume: 05 Year: 1956 Issue: 2 Page: 4

Coronation of Pope Pius XII
Scott # 68-71 (1939)